This article was designed to analyze different policy securing information inherent in bank or financial institutions information systems. The work is based on the development of DSS for the identification and prioritization of risks for Information System. The goal of this system is to support a decision maker by reducing the risks and intrinsic errors in the information related to the financial sector activities system. The proposed DSS is based and the AHP1 methodology. This method supports each manager to the choice of a specific decision in the development of management to demonstrate the organizational capacity to significantly reduce the losses associated with security vulnerabilities of information systems.